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-rw-r--r--mm/memcontrol.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 322d18d..014a4f1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3270,9 +3270,6 @@ void memcg_register_cache(struct kmem_cache *s)
css_get(&memcg->css);
- mutex_lock(&memcg->slab_caches_mutex);
- list_add(&s->memcg_params->list, &memcg->memcg_slab_caches);
- mutex_unlock(&memcg->slab_caches_mutex);
/*
* Since readers won't lock (see cache_from_memcg_idx()), we need a
@@ -3281,7 +3278,16 @@ void memcg_register_cache(struct kmem_cache *s)
*/
smp_wmb();
+ /*
+ * Initialize the pointer to this cache in its parent's memcg_params
+ * before adding it to the memcg_slab_caches list, otherwise we can
+ * fail to convert memcg_params_to_cache() while traversing the list.
+ */
root->memcg_params->memcg_caches[id] = s;
+
+ mutex_lock(&memcg->slab_caches_mutex);
+ list_add(&s->memcg_params->list, &memcg->memcg_slab_caches);
+ mutex_unlock(&memcg->slab_caches_mutex);
}
void memcg_unregister_cache(struct kmem_cache *s)
@@ -3293,16 +3299,21 @@ void memcg_unregister_cache(struct kmem_cache *s)
if (is_root_cache(s))
return;
- memcg = s->memcg_params->memcg;
- id = memcg_cache_id(memcg);
-
root = s->memcg_params->root_cache;
- root->memcg_params->memcg_caches[id] = NULL;
+ memcg = s->memcg_params->memcg;
+ id = memcg_cache_id(memcg);
mutex_lock(&memcg->slab_caches_mutex);
list_del(&s->memcg_params->list);
mutex_unlock(&memcg->slab_caches_mutex);
+ /*
+ * Clear the pointer to this cache in its parent's memcg_params only
+ * after removing it from the memcg_slab_caches list, otherwise we can
+ * fail to convert memcg_params_to_cache() while traversing the list.
+ */
+ root->memcg_params->memcg_caches[id] = NULL;
+
css_put(&memcg->css);
}
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